Cloud sync should not be on by default

With one of the recent updates, the cloud sync feature was added. This means a user's worlds can now be saved online and easily accessed from any device using that same account.

While this is definitely a helpful feature, this should not be on by default. It's frustrating enough that MC Edu requires an internet connection just to play a locally saved game, but now we're having to wait for the slow cloud sync process whenever a student closes their world.

I imagine it's a bit too late at this point, but generally when adding features that require an internet connection and additional bandwidth, it should be off by default and give users the choice to opt-in.